<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    span{
      width: 200px;
      height: 100px;
      float: left;
      border: 1px solid #000;
      /* margin: 10px 20px; */
      margin: 0 auto;
    }

    /* .box{
      width: 100px;
      height: 100px;
      background-color: chartreuse;
      margin: 0 auto;
    } */

  </style>
</head>

<body>
  <div>
    <span>1</span>
    <!-- <span>2</span>
    <span>3</span> -->
  </div>

  <!-- <div class="box"></div> -->
</body>

</html>